| http://www.w3.org/ns/prov#value | - Furthermore, even if there is an optical element such as a lens or a mirror disposed between the axial deflection point and the light blocking plate (upper and lower light blocking plates 10 aU and 10 aL (10 bU and 10 bL)), the influence upon the curved quantity ??H(Y) is sufficiently small as long as the power in the sub-scan direction of such optical element is small.
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